Compilare: main.cpp: In function 'int main()': main.cpp:5:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] {freopen("dreptunghiuri2.in","r",stdin);freopen("dreptunghiuri2.out","w",stdout);int i,j;scanf("%d%d",&n,&m);for(i=1;i<=n;++i)for(j=1;j<=m;++j) scanf("%d",&a[i][j]);for(i=1;i<=n;++i)for(j=1;j<=m;++j) if(a[i][j]) sq(i,j,1);printf("%d %d %d",c,maxg,nr); ^ main.cpp:5:81: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] {freopen("dreptunghiuri2.in","r",stdin);freopen("dreptunghiuri2.out","w",stdout);int i,j;scanf("%d%d",&n,&m);for(i=1;i<=n;++i)for(j=1;j<=m;++j) scanf("%d",&a[i][j]);for(i=1;i<=n;++i)for(j=1;j<=m;++j) if(a[i][j]) sq(i,j,1);printf("%d %d %d",c,maxg,nr); ^ main.cpp:5:109: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] {freopen("dreptunghiuri2.in","r",stdin);freopen("dreptunghiuri2.out","w",stdout);int i,j;scanf("%d%d",&n,&m);for(i=1;i<=n;++i)for(j=1;j<=m;++j) scanf("%d",&a[i][j]);for(i=1;i<=n;++i)for(j=1;j<=m;++j) if(a[i][j]) sq(i,j,1);printf("%d %d %d",c,maxg,nr); ^ main.cpp:5:165: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] {freopen("dreptunghiuri2.in","r",stdin);freopen("dreptunghiuri2.out","w",stdout);int i,j;scanf("%d%d",&n,&m);for(i=1;i<=n;++i)for(j=1;j<=m;++j) scanf("%d",&a[i][j]);for(i=1;i<=n;++i)for(j=1;j<=m;++j) if(a[i][j]) sq(i,j,1);printf("%d %d %d",c,maxg,nr); ^